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• Cisco 861 Router forces one-to-one NAT

  - by Slurpee

  I have a cisco 861 router that only allows one-to-one NATs in order to access the Internet. I would like for computers to get an address via DHCP from this router, and be able to access the Internet without needing to set a static NAT to one of my public IPs. What is wrong with the configuration? I have a basic understanding of the IOS CLI, most of the configuration file (edited for content) was created by my company's long gone Senior Network Engineer.

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• Cannot enable wireless Ubuntu 10.04

  - by woaddoa

  I have recently installed Ubuntu 10.04, however I am having trouble getting wireless to work. Ubuntu says that wireless is disabled, and I am unable to enable it. I have tried Administration Hardware Drivers however the only drivers listed are Nivida graphics ones. I am unsure what to do as I do not think the process is the same as searching for drivers for a windows machine. Any advice appreciated.

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• Why are home networks prefixed with 192.168 ?

  - by alex

  Why those numbers? For some historical reasons? Thanks

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• What does VNC reflectors basically do?

  - by honeybadger

  I am confused about what vnc reflector does. From the documentation http://sourceforge.net/projects/vnc-reflector/ I got that it's proxysitting between real VNC server (a host) and a number of VNC clients. My confusion is : 1. Does it make any changes to the coming stream from server 2. Does it make 1 connection with server to connect to many client or the connections are proportionate. Documentation is not clear in this. If anyone can help me?

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• Is there a way to detect which port on an ethernet switch a device is connected to?

  - by banno

  Since the wall jack is typically always connected to the same port on the switch I would like to be able to know which device is connected at a specific location. In my case I am talking about printers. I have code to go out on the network and find the IP Address of all of my printers, but would like to be able to update a server based on a printer being swapped out of a location for maintenance or repair. Is there a method for determining a port connection?

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• How can I monitor network usage by process on Mac OS X?

  - by psmith

  Is there any way to find out which process using how much internet bandwidth on Mac OS X Lion? I'm on mobile internet now, which is not very fast, so it would be nice if I can tell that for example, Chrome using 10kB/s, and Skype using 2kB/s. I can see the total amount of traffic in Activity Monitor, but it is not enough for me. I'd like to use an existing application, not interested to write an app like this. And I'm not interested in the actual traffic, only the number of bytes transferred and received by each processes.

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• lan extension over wide area

  - by avinash

  when we use technology like leased line to extend a lan over a wide area(like when connecting two offices such that hosts in both offices use private ip addresses) , why do we use encapsulations like ppp or hdlc...what can't we use the ethernet header to communicate because mac addresses are unique and can easily be used to identify hosts just like a small area lan... this question may seem a bit absurd but it has been bugging me...so plz explain

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• Run command on init and restart on errors

  - by chersanya

  I have internet access on my PC through proxy through SSH, so every time I need to execute ssh -L PORT:SERVER:PORT LOGIN@SERVER and then type a password. After each network failure or reconnect this command has to be executed again. I've got bored of it and look for a way to do this automatically: first run this after boot (it doesn't seem to be a problem - put this command in some init file and that's all) and then rerun it (if possible, then type password) on each network failure. Is it possible, and how? OS Linux (Debian)

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• How iptables behaves on timezone change?

  - by pradipta

  I have doubt how iptables keep changing the info in iptables when timezone is change. I am using iptables s v 1.4.8 I have blocked one IP with following details # date Thu Jun 6 12:46:42 IST 2013 #iptables -A INPUT -s 10.0.3.128 -m time --datestart 2013-6-6T12:0:00 --datestop 2013-6-6T13:0:00 -j DROP # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 10.0.3.128 anywhere TIME starting from 2013-06-06 12:00:00 until date 2013-06-06 13:00:00 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination But after I change the timezone following things happened automatically . AFTER TIME ZONE CHANGE +++++++++++++++++++++++ #date Thu Jun 6 15:17:48 HKT 2013 # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 10.0.3.128 anywhere TIME starting from 2013-06-06 14:30:00 until date 2013-06-06 15:30:00 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # The time value is changed in the rule . It is changing with the timezone how. Where iptables keeps track of timezone. Kindly explain me.

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• Network-related icons suddenly removed

  - by Velcro

  Hello, On a fresh Windows 7 installation, I created some shortcuts icons to network shares on the Desktop. Without any warning, these icons are sometimes and randomly deleted from Desktop. I totally don't understand what it happens! They are not hidden, they just are simply deleted. This behavior occurs on one computer in my company. Others Windows 7 computers are not affected by that. And also it's the first time I encounter that. Do you have an idea about this problem? Thanks.

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• Windows 8 Hidden Downloading? Slow Internet?

  - by EApubs

  After upgrading to Windows 8, im facing a very slow download speed. My router and the NIC is working fine because on the same PC I also have Linux. In Linux, everything works fine. When checking through the task manager, it shows that the system use the full bandwidth 1Mbps even without a download. The process menu doesn't show whats taking much bandwidth. The bitdefender's firewall also shows network activity. Is there any hidden apps downloading? How to fix this?

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• Combine multiple network interfaces to connect to a dedicated server

  - by Dženis Macanovic

  this is an underpaid employee writing, who's apparently responsible for all the IT stuff in a very small (non-IT) company. Today said company got a bunch of PCs/workstations, a switch, a computer that's supposed to be used as a router, two DSL connections (each 16 MBit/s downstream and 1 MBit/s upstream) and a dedicated server which is hosted and managed professionally by a larger local company with some decent connection speed (1 GBit/s both directions if I'm not mistaken). This is what I've set up (note I'm not making use of the second DSL connection at all)... ETH0 ETH1 [ SWITCH ]---[LINUX DEBIAN ROUTER]---[DSL MODEM 1]---[INTERNET] | | | PC1 | | PC2 | ... ... when my boss asked me, if it was somehow possible to get 32 MBit/s downstream and 2 MBit/s upstream. At that time I replied "no" without thinking too much about it. Now I've just had the following idea... ETH1 ETH0 ETH0 ,---[DSL MODEM 1 (NON-STATIC IP)]---, ,---, ETH0 [ SWITCH ]---[LINUX DEBIAN ROUTER] [INTERNET] [LINUX DEBIAN SERVER]---[INTERNET] | | | '---[ DSL MODEM 2 (STATIC IP) ]---' '---' PC1 | | ETH2 ETH0 PC2 | ... ... but I have absolutely no clue how to implement that. Would that even be possible? What would the masquerading rules look like on the router? What about the server? I didn't find anything on the internet, mainly because I couldn't come up with any good keywords to search for to begin with. English obviously isn't my first language. Thanks in advance for your time!

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• Opinion choosing Switch

  - by mastercode

  ) i have to reestruct a LAN network, with (currently) +/- 60hosts connected ... i have File Servers hosted, VoIP Phones,wireless AP's,printers, scanners, plotters,biometric dispositive,and 2 QNAP TS412 as FileServer and BackupServer, a Mac Mini as main Server of almost all services that need server ... and, a HP V1910-24 (L2+) and another two switches,but, only L2. which switch in your opinion, could fit better this reestruct, to ensure a VLAN division- and have to support Inter VLAN routing also - provide better performance, and also, allow a Future expansion. the budget, is low xD hehe!!

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• How long would this file transfer take?

  - by CT

  I have 12 hours to backup 2 TB of data. I would like to backup to a network share to a computer using consumer WD 2TB Black 7200rpm hard drives. Gigabit Ethernet. What other variables would I need to consider to see if this is feasible? How would I set up this calculation?

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• Prompt for credentials in a batch script

  - by Inteladu

  I am trying to perform a network copy of files via a batch script. However, as usual there are some networks where the 'copy' command fails saying 'Bad username or password'. And when I try using xcopy, it never works. I have also tried using, net use \\server\ password /user:domain\username net use \\server\ipc$ /user:domain\username password But none of these work. Any ideas on how I can accomplish this? I was also wondering if it is possible to prompt the ususal Windows login dialog for this...(just an idea) Any leads on this would be highly appreciated. Thanks & Regards, inteladu

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• Windows 7 Built-In VPN - How to access network shares, printers, etc.?

  - by mbrion

  After I have successfully connected to a Windows 7 box via the built-in VPN: how do I access shares, shared printers, network appliances, etc.? So, call me bad at googling, but: I can find dozens of articles on "How to Set up a VPN Connection" and "How to connect to a VPN" for Windows 7... but I can't find a single article on how to access resources after connecting. I have a home VPN set up in Windows 7; I was able to connect to it from my friend's Windows 7 machine last night. I expected to be able to UNC into my shares; I also expected to be able to go to "Start Computer" and Click "Network" on the left side, and then see all of the devices on my home network (while the VPN was connected). Am I missing something obvious? How do I make this happen?

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• ASUS WL-500gP v2 network between two local machines

  - by Epsiloncool

  I have two windows XP machines in my home networks, connected with ASUS WL-500gp V2 which also used as internet router. Problem is: while I have both computers normally goes to internet (used DHCP, static routes is ON, routing table is empty, operation mode is Home Gateway). I see both computers listed on the Network Neighborhood on 1st computer (wired to router), can enter to my own computer, but can not enter to other. I see only one computer (2nd) on the Network Neighborhood on 2nd computer (connected thru Wi-Fi), can enter to itself, getting error when trying to enter 1st computer address in address line (like \My1stComp). What is the problem? I totally crazy founding problem about 3 months.

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• How can I capture a process's network traffic?

  - by Yassin

  I would like to capture the traffic generated by a specific process (using Wireshark or other packet sniffer). Does anyone know how to do it? Thanks!

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• Is it possible to restrict the connection duration per client on the router (say with OpenWRT)?

  - by static

  How to limit the connection duration per client per period (say, one MAC-address can connect only for 3 hours per week to the network). Where could be defined such a rule? In the firewall? So the rule should define not statically times (this is simple), when the client is allowed to access the network, but the duration of the connection per day/week/month, etc. How/where to implement such rules? Is it possible to do so with OpenWRT/DD-WRT?

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• Is there a good tool for monitoring network activity on Mac OS X?

  - by xentek

  Is there a good bit of software on Mac OS X that I can use to monitor incoming and outgoing network activity? Nothing too geeky, I just want something simple to use. I'm on version 10.6 (Snow Leopard) if that helps.

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• Testifying that somaxconn change can make a difference

  - by petermolnar

  I got into an argument on the net.core.somaxconn parameter: I was told that it will not make any difference if we change the default 128. I believed this might be enough proof: "If the backlog argument is greater than the value in /proc/sys/net/core/somaxconn, then it is silently truncated to that value" http://linux.die.net/man/2/listen but it's not. So does anyone know a method to testify this with two machines, one running, for example MySQL or LVS and the other is hammering it in a GBit network? I'm opened to any solution, scripts are slightly more welcome.

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• How to control routes added by RasDial

  - by Robert Dodier

  I am using the RasDial function on a Windows box (Windows Server 2008) to dial a device from which the server then reads data. It seems that some new routes are added to the network routing table when the dial-up connection is made. That interferes with other network interfaces on the server. In particular, RasDial adds a default route which routes traffic to the device, which makes the server unreachable until the connection is dropped. Is there a way to control which routes are added by RasDial? I have been studying Microsoft's document for RasDial and associated items (RASDIALPARAMS, RASDIALEXTENSIONS) without finding anything about routing. There is an option for "Use default gateway on remote network" when configuring a VPN, but I don't see how to apply that in this case. Thanks for any light you can shed on this problem.

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• Port-Forwarding in Virtual Box

  - by davidzaz

  I have Virtual Box setup with the following commands: vboxmanage setextradata myVm "VBoxInternal/Devices/pcnet/0/LUN#0/Config/transfer/HostPort" 50000 vboxmanage setextradata myVm `"VBoxInternal/Devices/pcnet/0/LUN#0/Config/transfer/GuestPort" 50000 vboxmanage setextradata myVm "VBoxInternal/Devices/pcnet/0/LUN#0/Config/transfer/Protocol" TCP On the host machine, the following command times out: telnet localhost 50000 What am I doing wrong? The above command does work on the guest machine.

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• No wireless adapter in msi u200

  - by Mino Marimat

  I have a MSi u200, and the weird thing was that I was using this normally before, then after a few minutes all of a sudden it couldn't find the wifi signal from my house. I did some troubleshooting and a bit of search in the control panel, and it seems like my hardware is missing. :( I can't even turn on the wireless light using Fn+F8, so my suspicions about the missing hardware strengthened. I tried searching for DIY fixes, but I found out that the wireless card is actually built-in deeper, unlike the RAM cards and the hard drive where you can either replace or add more cards. What do I do?? As of the moment, I can get connected to my wifi here at home using a wireless adapter via usb, and it's working. So my guess about the hardware problem seems correct. HELP!!! Thanks!

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• Monitoring/logging a malfunctioning internet connection

  - by Pekka

  I have a mysterious internet connection problem: Every 15-20 minutes, the connection will become very slow, and take 2-3 minutes for anything to load. I've had a technician from the ISP over here to test the hardware, and everything is in pristine condition. They have no other explanation than a configuration error on my machine, a possibility I can exclude 90% because I'm experiencing the same problems with another machine. I will have to monitor the situation now, and I would like to run a program that logs when internet connections become slow. I thought about putting something together using at and wget. Does anybody know of some other tool for this that does this out of the box - maybe something with an adjustable request frequency, logging connection speeds etc.?

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